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Dr. Daniel Y. Gezari
local time: 2024-02-24 21:15 (-04:00 DST)
Dr. Daniel Y. Gezari (Abstracts)
Titles Abstracts Details
  • Lunar Laser Ranging Test of the Invariance of c (2009) [Updated 1 decade ago]
    by Daniel Y. Gezari   read the paper:

    The speed of laser light pulses launched from Earth and returned by a retro-reflector on
    the Moon was calculated from precision round-trip time-of-flight measurements and
    modeled distances. The measured speed of light (c) in the moving observer?s rest frame
    was found to exceed the canonical value c = 299,792,458 m/s by 200?10 m/s, just the
    speed of the observatory along the line-of-sight due to the rotation of the Earth during
    the measurements. This result is a first-order violation of local Lorentz invariance; the
    speed of light seems to depend on the motion of the observer after all, as in classical wave
    theory, which implies that a preferred reference frame exists for the propagation of light.
    However, the present experiment cannot identify the physical system to which such a
    preferred frame might be tied.